Answer
7331 electrons
Work Step by Step
m of proton = 1.0073 amu
m of electron = 0.00055 amu
m of neutron = 1.0087 amu
total m of nucleus = (2*1.0073) + (2*1.0087) = 4.032 amu
4.032 / 0.00055 = 7331
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